EP 0789900 A1 19970820 - REDUCTION OF COMPUTATIONAL BURDEN OF ADAPTIVELY UPDATING CONTROL FILTER(S) IN ACTIVE SYSTEMS
Title (en)
REDUCTION OF COMPUTATIONAL BURDEN OF ADAPTIVELY UPDATING CONTROL FILTER(S) IN ACTIVE SYSTEMS
Title (de)
REDUZIERUNG DER BERECHNUNGSLAST ZUR ADAPTIVEN AKTUALISIERUNG VON STEUERUNGSFILTER IN AKTIVEN SYSTEME
Title (fr)
REDUCTION DU NOMBRE DE CALCULS A EFFECTUER DANS LE CAS D'UNE ACTUALISATION ADAPTATIVE DE FILTRE(S) DE COMMANDE DANS LES SYSTEMES ACTIFS
Publication
Application
Priority
- US 9513453 W 19951019
- US 33446794 A 19941104
Abstract (en)
[origin: WO9614634A1] An active control method and apparatus for controlling vibration or sound wherein the computational burden to adaptively update the control filter within the update model is reduced. The apparatus includes means (not represented) for producing an input signal (36) for input to the update model (22) and the reduction block (26), means (not represented) for generating an error signal (41), and an output device (25) for canceling sound and/or vibration at a selected location. The method uses a gradient descent algorithm such as the filtered-x LMS algorithm and replaces the long filter model (23, 24) with a shortened length filter model (28, 30, 30'). Error signal information together with the output information from the shortened length filter model are used to update the coefficients of the control filter (32) according to an update calculation method. The shortened filter model only contains frequency response information at the L frequencies of interest. Because of the reduced amount of information contained in the shortened filter model, more updates per unit of time can be performed on the control filter(s) or a smaller or fewer processors or CPU's may be utilized. The method has applicability to feed-forward and feed-back type systems and also to systems using a waveform generator for supplying the input signal. The reduction method may be implemented on-line or off-line.
IPC 1-7
IPC 8 full level
G10K 11/178 (2006.01); H03H 21/00 (2006.01)
CPC (source: EP US)
G10K 11/17815 (2017.12 - EP US); G10K 11/17817 (2017.12 - EP US); G10K 11/17854 (2017.12 - EP US); G10K 11/17855 (2017.12 - EP US); G10K 11/17879 (2017.12 - EP US); G10K 11/17881 (2017.12 - EP US); H03H 21/0012 (2013.01 - EP US); G10K 2210/3011 (2013.01 - EP US); G10K 2210/3017 (2013.01 - EP US); G10K 2210/3026 (2013.01 - EP US); G10K 2210/3027 (2013.01 - EP US); G10K 2210/3031 (2013.01 - EP US); G10K 2210/3032 (2013.01 - EP US); G10K 2210/3042 (2013.01 - EP US); G10K 2210/3049 (2013.01 - EP US); G10K 2210/3053 (2013.01 - EP US); G10K 2210/3054 (2013.01 - EP US)
Citation (search report)
See references of WO 9614634A1
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
WO 9614634 A1 19960517; DE 69513849 D1 20000113; DE 69513849 T2 20000629; EP 0789900 A1 19970820; EP 0789900 B1 19991208; US 5745580 A 19980428
DOCDB simple family (application)
US 9513453 W 19951019; DE 69513849 T 19951019; EP 95939543 A 19951019; US 33446794 A 19941104